John Twelve Hawks - The Golden City (Fourth Realm #3)

The Golden City:
In the last book of the Fourth Realm series, Twelve Hawks delivers the climax to his spellbinding epic. Struggling to protect the legacy of his Traveler father, Gabriel faces troubling new questions and relentless threats. His brother Michael, now firmly allied with the enemy, pursues his ambition to wrest power from Nathan Boone, the calculating leader of the Brethren. And Maya, the Harlequin warrior pledged to protect Gabriel at all costs, is forced to make a choice that will change her life forever.
A riveting blend of high-tech thriller and fast-paced adventure, The Golden City will delight Twelve Hawks's many fans and attract a new audience to the entire trilogy.